Ice
ACID
Liquid refrigerant charging of a system is normally accomplished in the liquid line. For example, when a system is out of refrigerant, liquid refrigerant can be charged into the king valve on the liquid line or receiver.
There is a test kit you can buy at a refrigeration distributor that allows you to capture a refrigerant sample. With this kit you can tell acid levels and moisture content. You need to know what you're doing to get a clean, non contaminated sample.
Vaporizing the refrigerant
To endure that the ONLY gas in the system is refrigerant.
The refrigerant in the refrigrration system absorbs large quantities of heat and releases it to the atmosphere
Vaporizing the Refrigerant
Two problems that a refrigeration system could have are compressor problems or a lack of or loss of refrigerant gas.
Condensor
Use a vacuum pump that pulls it into a tank.
The compressor oil
superheated vapor